Archivum.info - Large archive of mailing lists and newsgroups.
CataList - The official catalog of LISTSERV lists.
Dolist.net - References all mailing list types, discussion, diffusion, newsletter, e-zine, alert bulletin, and newsgroups.
Email Newsletters & Ezines at Tile.net - Large mailing list directory.
I Want Newsletters - A large collection of free newsletters sorted by category.
listTool - A directory of lists that includes an easy way of subscribing and unsubscribing to them.
openSubscriber - A mail-to-web gateway with searchable archives of public mailing lists.
Public Mailing Lists Managed by Arrow - A frequently-updated list of publicly accessible mailing lists managed by users of Roger Smith Software's Arrow Mailing List Server.
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